Need help configuring DNS, Zimbra and Bind already installed

I have the newest Zimbra installed and Bind installed on Debian Etch. The webmail and admin work, however I don't think I have DNS setup correctly. I have my resolve.conf pointing at my server with bind.

Below is the only thing I have modified in my named.conf, "mydomain.net" has my real domain.

zone "mydomain.net" {
type master;
file "/etc/bind/db.local";
};

Can anyone point me at a doc or walk me through setting up DNS so mail will flow correctly?

I have external DNS setup at EveryDNS.net and am pointing to the external IP and have NAT setup correctly on the firewall.

You'll find these details of Split DNS set-up should enable you to get it running, there's also some diagnostic tips in the forums if you want to post the output here. You'll also need a correctly configured /etc/hosts file, see the Quick Start Guide for details.